The tags work the same as if you had put a (hidden) WikiLink on
the page for each tag, so you can use a PageSpec match all
pages that are tagged with a given tag, for example. The tags will also
show up on blog entries and at the bottom of the tagged pages, as well as
in RSS and Atom feeds.

If you want a visible WikiLink along with the tag, use taglink
instead:

[[!taglink foo]]
[[!taglink tagged_as_foo|foo]]

Note that if the wiki is configured to use a tagbase, then the tags will be
located under a base directory, such as "tags/". This is a useful way to
avoid having to write the full path to tags, if you want to keep them
grouped together out of the way. Also, since ikiwiki then knows where to put
tags, it will automatically create tag pages when new tags are used.

Bear in mind that specifying a tagbase means you will need to incorporate it
into the link()PageSpec you use: e.g., if your tagbase is
tag, you would match pages tagged "foo" with link(tag/foo).

If you want to override the tagbase for a particular tag, you can use
something like this: